Beat butter and sugar at medium speed with an electric mixer until creamy. Add egg and almond extract; beat until smooth. Combine flour and salt in a separate bowl; add to butter mixture, stirring until a soft dough forms. Divide dough in half; wrap in plastic wrap and chill one hour.
Roll dough to 1/4-inch thickness on a lightly floured surface. Use alphabet cookie cutters to cut out "happy birthday" cookies; place on greased baking sheets. Bake at 350 degrees for 8 to 10 minutes; cool on wire racks with wax paper underneath racks. Spoon Icing over letters and top with colored sprinkles.
I think there is something missing in this recipe. The 'dough' did not form at all. It was more or less just crumbs. I followed everytyhing perfectly, and even after I let it chill for an hour, as soon as I unwrapped it, it crumbled. I even tried to roll it, smash it, anything to get it to stick together, nothing worked.
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